WorldWatchr has developed an application for the iPhone that allows you to monitor web images of places around the world. Here is more info about the app:

Now you can stay in touch with your home, famous places of the world, the current traffic conditions and much more by watching your favorite web cameras. This WorldWatchr application makes it easy to monitor web images which are continuously updated (like web cam pictures). It can cycle through all your cams and updates the images periodically. Automatically updates the thumbnails on the overview screen. See what?s going on several places all at once.

The images don't have to be produced by web cams. You can monitor any image which is updated over time like weather radars, traffic maps and so on.

The webcams and settings are either stored as a cookie in the browser on your local computer or on our server so that you can access them from everywhere even from your iPhone.